JP2002001398A - Process and equipment for treating sludge - Google Patents
Process and equipment for treating sludgeInfo
- Publication number
- JP2002001398A JP2002001398A JP2000193875A JP2000193875A JP2002001398A JP 2002001398 A JP2002001398 A JP 2002001398A JP 2000193875 A JP2000193875 A JP 2000193875A JP 2000193875 A JP2000193875 A JP 2000193875A JP 2002001398 A JP2002001398 A JP 2002001398A
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- Prior art keywords
- sludge
- treatment
- ozone
- excess sludge
- concentrated
- Prior art date
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- Treatment Of Sludge (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、有機性排液を好気
性生物処理する過程で発生する余剰汚泥の処理方法及び
装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for treating excess sludge generated in an aerobic biological treatment of an organic wastewater.
【０００２】[0002]
【従来の技術】下水、し尿、各種産業排水などの有機性
排液は、一般に，図５に示されるような活性汚泥法等の
好気性生物処理によって処理されている。この活性汚泥
方法は、有機性排液Ｗを貯留槽１から曝気槽２に導き好
気性条件の下で活性汚泥と接触させて好気性生物処理さ
せる。しかる後、処理液Ｗ0を沈澱槽３にて処理水Ｗ1と
余剰汚泥Ｓとに固液分離する。2. Description of the Related Art Organic effluents such as sewage, human waste, and various industrial wastewaters are generally treated by an aerobic biological treatment such as an activated sludge method as shown in FIG. In this activated sludge method, an organic wastewater W is guided from a storage tank 1 to an aeration tank 2 and is brought into contact with activated sludge under aerobic conditions to be subjected to aerobic biological treatment. Thereafter, the treatment liquid W 0 is solid-liquid separated into the treated water W 1 and the excess sludge S in the settling tank 3.
【０００３】この余剰汚泥Ｓの一部は、好気性微生物源
として一部が返送経路１０を介して曝気槽２に返送され
る。この有機性排液の処理過程において回収される余剰
汚泥Ｓの量は非常に多い。従来、この余剰汚泥Ｓは、汚
泥を濃縮する濃縮処理５、濃縮汚泥Ｓａを安定化および
減容化する嫌気性消化処理８、消化汚泥Ｓｃの脱水処理
９などの処理が施されたのち脱水ケーキとして最終処分
されたり、焼却・溶融処理など更なる減容化が図られ
る。A part of the surplus sludge S is returned to the aeration tank 2 via a return path 10 as a source of aerobic microorganisms. The amount of excess sludge S collected in the process of processing the organic waste liquid is very large. Conventionally, this excess sludge S is subjected to a treatment such as a concentration treatment 5 for condensing sludge, an anaerobic digestion treatment 8 for stabilizing and reducing the volume of the concentrated sludge Sa, and a dehydration treatment 9 for digested sludge Sc, and then a dewatered cake. As a result, the volume is further reduced by incineration and melting.
【０００４】嫌気性消化処理は、汚泥自身の保有するエ
ネルギーを主にメタンガスなどとして回収しつつ余剰汚
泥を安定化、減容化させる処理方法であり、汚泥処理工
程の中では重要かつ有効な手段である。The anaerobic digestion treatment is a treatment method for stabilizing and reducing excess sludge while recovering mainly the energy held by the sludge itself as methane gas or the like, and is an important and effective means in the sludge treatment process. It is.
【０００５】しかし、近年の汚泥性状の変化等の原因に
よって、消化効率の低下や、消化日数の長期間化が問題
となっている。However, due to recent changes in sludge properties and the like, there has been a problem that the digestion efficiency is reduced and the digestion days are lengthened.
【０００６】また、最終処分場の確保や、汚泥処理の費
用の増加も深刻になってきており、余剰汚泥を可能な限
り生じないように長時間曝気処理する方法、特開平９−
７５９７８号の示されているように、余剰汚泥の一部を
高温で可溶化して好気性生物処理のための曝気槽に返送
するあるいは生物難分解性有機物をオゾン酸化処理した
後曝気槽に返送する方法が提案されている。その他、酸
やアルカリ処理などの各種の方法も提案されている。Also, securing of a final disposal site and an increase in the cost of sludge treatment have become serious, and a method of performing aeration treatment for a long time so as not to generate excess sludge as much as possible has been proposed.
As shown in No. 75978, a part of the excess sludge is solubilized at high temperature and returned to the aeration tank for aerobic biological treatment, or returned to the aeration tank after biorefractory organic substances are subjected to ozone oxidation treatment. A way to do that has been proposed. In addition, various methods such as an acid or alkali treatment have been proposed.
【０００７】[0007]
【発明が解決しようとする課題】前述の酸やアルカリ処
理では薬品コストが嵩み、処理量が大きい設備には不向
きである。The acid and alkali treatments described above increase the cost of chemicals and are not suitable for equipment having a large throughput.
【０００８】また、特開平９−７５９７８号に開示され
た高温での可溶化処理及びオゾン酸化処理した後に曝気
槽（好気性生物処理）に返送する方法は有効であるとも
考えられるが、返送分が好気性生物処理の負荷増となり
処理水質が悪化する。The method disclosed in Japanese Patent Application Laid-Open No. 9-75978, in which solubilization treatment at a high temperature and ozone oxidation treatment are performed and then returned to an aeration tank (aerobic biological treatment) is considered to be effective. However, the load of aerobic biological treatment increases and the quality of treated water deteriorates.
【０００９】さらに根本的に、この方法では、いったん
好気性生物処理により微生物生体内に蓄積されたリンや
窒素の一部が高温での可溶化処理及びオゾン酸化処理に
より再び溶出し、返送処理によりリンの返送・循環系内
の蓄積及び窒素濃度の上昇を生じる可能性が懸念され
る。[0009] More fundamentally, in this method, a part of phosphorus and nitrogen accumulated in the microorganism organism once by the aerobic biological treatment is eluted again by the solubilization treatment at a high temperature and the ozone oxidation treatment, and is returned by the return treatment. There is a concern that phosphorus may accumulate in the return / circulation system and increase the nitrogen concentration.
【００１０】この点に関し、本発明者らは、実験によ
り、オゾンによって余剰汚泥を可溶化した場合、溶解性
リンおよび生物難分解性物質濃度の指標となるＣＯＤ値
が上昇することを知見している。表１に、余剰汚泥をオ
ゾン処理によって可溶化したときの汚泥の成分変化を示
す。[0010] In this regard, the present inventors have found through experiments that when solubilizing excess sludge with ozone, the COD value, which is an index of the concentration of soluble phosphorus and biorefractory, increases. I have. Table 1 shows changes in sludge components when excess sludge is solubilized by ozone treatment.
【００１１】[0011]
【表１】 [Table 1]
【００１２】この表１に注目すると、オゾン処理により
ＳＳ濃度が低下し、溶解性のリン濃度が上昇し、溶解性
リン／全リンの比率は２０．６％にも達することがあ
り、ＣＯＤ値も上昇することが判る。このことは、オゾ
ン処理によって汚泥中の有機性物質やリン等が汚泥より
放出されて可溶化することを示している。したがって、
好気性生物処理への返送に伴ってリンや窒素などの返送
・循環系内の蓄積を生じるのである。Looking at Table 1, the ozone treatment lowers the SS concentration, increases the soluble phosphorus concentration, and the ratio of soluble phosphorus / total phosphorus may reach 20.6%. It can be seen that also rises. This indicates that organic substances, phosphorus, and the like in the sludge are released from the sludge and solubilized by the ozone treatment. Therefore,
The return to the aerobic biological treatment causes the return and accumulation of phosphorus and nitrogen in the circulation.
【００１３】そこで、本発明の主たる課題は、余剰汚泥
を濃縮し、この濃縮汚泥に対してオゾン処理することに
よって、汚泥を可溶化させ、嫌気性消化の分解率を高
め、消化ガスの発生量の増加を図り、もって汚泥の減容
化率を高め、最終処分汚泥量を低減させることができ、
他方で可溶化処理を施した汚泥を好気性生物処理へ返送
させないことによりリンや窒素などの返送・循環系内の
蓄積を回避することにある。Therefore, a main object of the present invention is to concentrate excess sludge and subject the concentrated sludge to ozone treatment to solubilize the sludge, increase the decomposition rate of anaerobic digestion, and increase the amount of digested gas generated. Increase the volume of sludge, and reduce the amount of sludge for final disposal.
On the other hand, it is to avoid accumulation of phosphorus and nitrogen in the return / circulation system by not returning sludge subjected to solubilization to aerobic biological treatment.
【００１４】[0014]
【課題を解決するための手段】上記課題を解決した本発
明の請求項１記載の発明は、有機性排液の好気性生物処
理によって際に発生する余剰汚泥の処理方法であって、
余剰汚泥を濃縮処理した後に、濃縮した余剰汚泥をオゾ
ンによって可溶化処理し、その後この可溶化処理汚泥を
嫌気性消化処理することを特徴とする汚泥の処理方法で
ある。Means for Solving the Problems The invention according to claim 1 of the present invention, which has solved the above-mentioned problems, is a method for treating excess sludge generated by aerobic biological treatment of an organic effluent,
This is a method for treating sludge, characterized in that after the excess sludge is concentrated, the concentrated excess sludge is solubilized with ozone, and then the solubilized sludge is subjected to anaerobic digestion.
【００１５】請求項２記載の発明は、オゾンによる可溶
化処理の前に、余剰汚泥を５０℃以上１００℃未満の温
度に加熱処理を行う請求項１記載の余剰汚泥の処理方法
である。The invention according to claim 2 is the method for treating excess sludge according to claim 1, wherein the excess sludge is heated to a temperature of 50 ° C. or more and less than 100 ° C. before the solubilization treatment with ozone.
【００１６】請求項３記載の発明は、可溶化処理汚泥は
好気性生物処理に返送しない請求項１記載の余剰汚泥の
処理方法である。The invention according to claim 3 is the method for treating excess sludge according to claim 1, wherein the solubilized sludge is not returned to the aerobic biological treatment.
【００１７】請求項４記載の発明は、有機性排液の好気
性生物処理手段と、その好気性生物処理によって際に発
生する余剰汚泥を濃縮処理する手段と、濃縮した余剰汚
泥をオゾン処理によって可溶化する手段と、その可溶化
処理汚泥を嫌気性消化処理手段とを含むことを特徴とす
る汚泥の処理装置である。The invention according to claim 4 is an aerobic biological treatment means for organic wastewater, a means for concentrating excess sludge generated at the time of the aerobic biological treatment, and an ozone treatment for condensing excess sludge. An apparatus for treating sludge, comprising: means for solubilizing; and means for anaerobic digestion of the solubilized sludge.
【００１８】請求項５記載の発明は、有機性排液の好気
性生物処理によって発生する余剰汚泥を濃縮処理する手
段と、濃縮した余剰汚泥をオゾン処理および熱処理によ
って可溶化する手段と、その可溶化処理汚泥を嫌気性消
化処理手段とを含むことを特徴とする汚泥の処理装置で
ある。According to a fifth aspect of the present invention, there is provided means for concentrating excess sludge generated by aerobic biological treatment of an organic wastewater, means for solubilizing the concentrated excess sludge by ozone treatment and heat treatment, and An apparatus for treating sludge, characterized by comprising anaerobic digestion treatment means for solubilized sludge.
【００１９】[0019]
【発明の実施の形態】本発明の実施の形態を図面を参照
しながら以下に詳述する。 ＜第１の実施の形態＞図１に示す第１の実施の形態にお
いては、下水などの有機性排液Ｗが、貯留槽１にいった
ん貯留された後、曝気槽２に導入され、曝気槽２におい
て好気性条件にて活性汚泥と接触させられて好気性生物
処理される。本発明にいう好気性生物処理とは、活性汚
泥法、嫌気・好気活性汚泥法、生物学的硝化脱窒法、担
体添加活性汚泥法、生物膜法等、少なくとも処理工程内
に好気性曝気槽を持つ生物処理法の総称を意味する。処
理液Ｗ0は沈澱槽３にて処理水Ｗ1と余剰汚泥Ｓとに固液
分離され、清澄処理水Ｗ1は水質調整槽４にて水質調整
し、処理系外へ放流される。Embodiments of the present invention will be described in detail below with reference to the drawings. <First Embodiment> In a first embodiment shown in FIG. 1, an organic wastewater W such as sewage is temporarily stored in a storage tank 1 and then introduced into an aeration tank 2 to be aerated. In step 2, the activated sludge is brought into contact with the activated sludge under aerobic conditions and subjected to aerobic biological treatment. The aerobic biological treatment referred to in the present invention is an activated sludge method, an anaerobic / aerobic activated sludge method, a biological nitrification denitrification method, a carrier-added activated sludge method, a biofilm method, etc. Means a general term for biological treatment methods. The treatment liquid W 0 is solid-liquid separated into treated water W 1 and excess sludge S in the settling tank 3, and the clarified treated water W 1 is adjusted in water quality in the water quality adjusting tank 4 and discharged out of the treatment system.
【００２０】一方、余剰汚泥Ｓは、好気性微生物源とし
て必要分を返送経路１０を介して曝気槽２に返送し、他
部を遠心分離機などの濃縮装置５により濃縮処理する。
次いで、濃縮処理した濃縮余剰汚泥Ｓａはオゾン処理槽
７Ｂに移送してオゾン処理する。オゾン処理槽７Ｂで
は、オゾン発生装置７Ａで発生させたオゾンＯ3を導入
し、濃縮余剰汚泥Ｓａの可溶化処理を行う。ここで、排
オゾンＯ3は排気経路を通って排オゾン処理塔７Ｅにて
処理して分解無害化したのちに大気解放する。ここで、
余剰汚泥のオゾン処理はバッチ式または連続式のどちら
の方式で行ってもよい。On the other hand, surplus sludge S is returned to the aeration tank 2 via a return path 10 as a necessary source of aerobic microorganisms, and the other portion is concentrated by a concentration device 5 such as a centrifuge.
Next, the concentrated excess sludge Sa that has been subjected to the concentration treatment is transferred to the ozone treatment tank 7B for ozone treatment. In the ozone treatment tank 7B, the ozone O 3 generated by the ozone generator 7A is introduced, and the concentrated excess sludge Sa is solubilized. Here, the exhausted ozone O 3 passes through an exhaust path, is treated in an exhausted ozone treatment tower 7E, is decomposed and made harmless, and is then released to the atmosphere. here,
Ozone treatment of excess sludge may be performed by either a batch type or a continuous type.
【００２１】次いで、オゾン処理槽７Ｂにて可溶化処理
した余剰汚泥Ｓｂは、好気性生物処理に返送することな
く嫌気性消化処理装置８に移送し、嫌気性消化処理を行
い、発生ガスＧを回収するとともに余剰汚泥Ｓｂを安定
化および減容化を図る。この嫌気消化処理は、従来技術
に基づいて行うことができ、嫌気性消化処理での滞留時
間は、処理する汚泥の性状などによって、適宜変更する
ことができる。Next, the excess sludge Sb solubilized in the ozone treatment tank 7B is transferred to the anaerobic digestion treatment device 8 without being returned to the aerobic biological treatment, and is subjected to anaerobic digestion treatment. At the same time, the excess sludge Sb is stabilized and reduced in volume. This anaerobic digestion treatment can be performed based on a conventional technique, and the residence time in the anaerobic digestion treatment can be appropriately changed depending on the properties of the sludge to be treated.
【００２２】嫌気性消化処理によって減容化および安定
化した後の廃汚泥Ｓｃは、脱水機９にて脱水したのち、
この脱水ケーキや焼却処理を施した焼却処分を施した焼
却灰等の形態で最終処分に供したり、コンポスト・建設
資材等のリサイクル原料となる。The waste sludge Sc, which has been reduced in volume and stabilized by anaerobic digestion, is dehydrated in a dehydrator 9 and then dewatered.
This dehydrated cake or incinerated ash subjected to incineration is used for final disposal or as a recycled material for composting and construction materials.
【００２３】＜第２の実施の形態＞本発明の第２の実施
の形態を図２に示す。濃縮装置５により濃縮処理した濃
縮余剰汚泥Ｓａは、オゾン処理槽７Ｂにてオゾン処理す
るに先立ち、加熱装置６にて５０℃以上１００℃未満の
温度、より好適には６０〜８０℃に加熱するものであ
る。この加熱処理を行うことにより、オゾン処理による
可溶化が促進される。<Second Embodiment> FIG. 2 shows a second embodiment of the present invention. Prior to the ozone treatment in the ozone treatment tank 7B, the concentrated excess sludge Sa that has been subjected to the concentration treatment by the concentration device 5 is heated to a temperature of 50 ° C. or more and less than 100 ° C., more preferably 60 to 80 ° C., in the heating device 6. Things. By performing this heat treatment, solubilization by ozone treatment is promoted.
【００２４】（実験例）本発明者らは、実験により、余
剰汚泥を濃縮した後に、オゾン処理によって可溶化する
と、嫌気性消化効果が促進されることを知見した。以下
にその実験例を示す。本実験には、某下水処理場におけ
る下水処理過程で排出される余剰汚泥を遠心濃縮機にて
濃縮した濃縮余剰汚泥を用い、オゾン処理により可溶化
を行った後、嫌気性消化処理した。実験条件を表２に示
す。(Experimental Example) The present inventors have found through experiments that, when excess sludge is concentrated and then solubilized by ozone treatment, the anaerobic digestion effect is promoted. The following is an experimental example. In the present experiment, the excess sludge discharged in a sewage treatment process at a certain sewage treatment plant was concentrated by a centrifugal concentrator, solubilized by ozone treatment, and then subjected to anaerobic digestion treatment. Table 2 shows the experimental conditions.
【００２５】[0025]
【表２】 [Table 2]
【００２６】本実験に使用したオゾン処理装置を図１
に、嫌気性消化処理装置は概略図を図２に示す。オゾン
処理装置７は、オゾン発生装置７ＡからオゾンＯ３3が
処理槽７Ｂに供給されるようになっている。前記処理槽
７Ｂには撹拌機７Ｃが取り付けられていて、撹拌混合に
より汚泥とオゾンＯ3とが均質に接触するようになって
いる。さらに、オゾン発生装置７Ａから処理槽７Ｂにい
たる経路には、発生オゾン濃度計７Ｄが取り付けられて
いて、処理槽７Ｂに供給されるオゾン濃度が測定される
ようになっている。また、処理槽７Ｂから排出された排
オゾンＯ3は、排気経路に設置された排オゾン濃度計７
Ｄ’でオゾン濃度を確認されながら排オゾン処理塔７Ｅ
に導かれて分解無害化されたのち大気解放されるように
なっている。FIG. 1 shows the ozone treatment apparatus used in this experiment.
FIG. 2 shows a schematic diagram of the anaerobic digester. Ozone treatment device 7, ozone O3 3 is adapted to be supplied to the processing tank 7B from the ozone generator 7A. A stirrer 7C is attached to the treatment tank 7B so that the sludge and the ozone O 3 come into uniform contact by stirring and mixing. Further, a generated ozone concentration meter 7D is attached to a path from the ozone generator 7A to the processing tank 7B so that the concentration of ozone supplied to the processing tank 7B is measured. Further, the discharged ozone O 3 discharged from the processing tank 7B is supplied to a discharged ozone concentration meter 7 provided in the exhaust path.
While the ozone concentration is confirmed at D ', the exhaust ozone treatment tower 7E
After being decomposed and made harmless by being introduced to the atmosphere, it is released to the atmosphere.
【００２７】一方、嫌気性消化処理装置８は、ヒータ８
Ｂにより加温される温水ジャケット槽内に単位消化槽８
Ａが複数並んで配置され、温度センサー８Ｃが設置さ
れ、消化槽８Ａ内の汚泥の温度管理ができるようになっ
ている。また、発生するガスは、架台８Ｆ上に設けられ
た水槽８Ｅに設置されているガス捕集管８Ｄにて捕集
し、その量を測定するようになっている。On the other hand, the anaerobic digester 8 comprises a heater 8
Unit digestion tank 8 in warm water jacket tank heated by B
A is arranged side by side, a temperature sensor 8C is installed, and the temperature of the sludge in the digestion tank 8A can be controlled. The generated gas is collected by a gas collecting pipe 8D provided in a water tank 8E provided on a gantry 8F, and the amount thereof is measured.
【００２８】実験は、まず、オゾン処理装置にて、濃縮
余剰汚泥をオゾン処理し、次いで、嫌気性消化処理装置
の消化槽にオゾン処理汚泥を移して嫌気性消化を行っ
た。オゾンによる可溶化は、処理槽に投入した濃縮余剰
汚泥に、１０、２０、４０（ｍｇ−Ｏ3／ｇ−ＴＳ）で
オゾンを添加した。また、嫌気性消化処理は、上記下水
処理場の既設二次消化汚泥を種汚泥として半連続式にて
実施した。濃縮余剰汚泥のオゾン処理済汚泥の性状変化
を表３に示す。In the experiment, the concentrated excess sludge was first treated with ozone by an ozone treatment device, and then the ozone-treated sludge was transferred to a digestion tank of an anaerobic digestion treatment device to perform anaerobic digestion. Solubilization with ozone, the concentration excess sludge charged into the treatment tank was added ozone at 10,20,40 (mg-O 3 / g -TS). In addition, the anaerobic digestion treatment was carried out in a semi-continuous manner using the existing secondary digestion sludge at the sewage treatment plant as seed sludge. Table 3 shows changes in the properties of the ozone-treated sludge of the concentrated excess sludge.
【００２９】[0029]
【表３】 [Table 3]
【００３０】表３に示されるとおり、オゾンによる可溶
化によって、汚泥性状の改質効果について以下のことが
明らかになった。オゾンによる可溶化によって、ＳＳ
成分が約３．８％から約３．５％に減少し溶解性成分が
増加する。オゾンによる可溶化によって生じる、溶解
性物質ＤＳ、溶解性ＣＯＤ、溶解性ＴＯＣの溶解性成分
は、オゾン添加率にほぼ比例して増加する。オゾンに
よる可溶化を行った系において、有機分（ＶＴＳ）の割
合は８３％程度でありほとんど変化せず、０〜４０（ｍ
ｇ−Ｏ3／ｇ−ＴＳ）の範囲では、汚泥中の有機分は可
溶化の状態でとどまり、ガス化まではいたらない。４
０ｍｇ−Ｏ3／ｇ−ＴＳの添加率では濃縮余剰汚泥の粘
度は約５０〜８０％低下する。As shown in Table 3, the following was clarified regarding the effect of modifying the sludge properties by solubilization with ozone. By solubilization with ozone, SS
The component is reduced from about 3.8% to about 3.5% and the soluble component is increased. The soluble components of the soluble substance DS, the soluble COD, and the soluble TOC generated by the solubilization with ozone increase almost in proportion to the ozone addition rate. In the system in which ozone was solubilized, the ratio of the organic component (VTS) was about 83%, hardly changed, and was 0 to 40 (m
The g-O 3 / g-TS ) range, organic matter in the sludge remains in the state of solubilized, not lead up to gasification. 4
The viscosity of the concentrated waste sludge is addition ratio of 0mg-O 3 / g-TS is reduced by about 50-80%.
【００３１】オゾンによる可溶化によって濃縮余剰汚泥
中の固形分が酸化分解されることにより低分子化してそ
の一部が可溶化されたと推察できる。また、汚泥中固形
物の低分子化等の作用によって、汚泥の粘性が低下する
と考えられる。It can be inferred that the solid content in the concentrated excess sludge is oxidized and decomposed by solubilization with ozone, whereby the sludge is reduced in molecular weight and a part thereof is solubilized. In addition, it is considered that the viscosity of the sludge is reduced by the action of depolymerizing the solid matter in the sludge.
【００３２】次いで、オゾン処理した濃縮余剰汚泥と未
処理の濃縮余剰汚泥とを嫌気性消化したときに、汚泥の
成分変化を表４に示す。Next, when the concentrated excess sludge treated with ozone and the untreated concentrated excess sludge were anaerobically digested, changes in the components of the sludge are shown in Table 4.
【００３３】[0033]
【表４】 [Table 4]
【００３４】濃縮余剰汚泥をオゾンによって可溶化する
ことによって、以下の結果から、嫌気性消化の促進効果
が得られることが明らかとなった。未処理の濃縮余剰
汚泥とオゾン処理をした濃縮余剰汚泥とを比較すると、
４０ｍｇ−Ｏ3／ｇ−ＴＳの添加率で、ＴＳは、２４，
４９０ｍｇ／ｌ→２２，８６５ｍｇ／ｌに低下し、また
ＶＴＳは、７６．１１％→７３．５６％に低下した。
４０ｍｇ−Ｏ3／ｇ−ＴＳの添加率で、消化率は約９ポ
イントの上昇、ＶＴＳ分解率で約７ポイントの上昇が確
認された。投入ＶＴＳあたりのガス発生量は、オゾン
添加率に比例して増加し、２０ｍｇ−Ｏ3／ｇ−ＴＳで
約１．３倍、４０ｍｇ−Ｏ3／ｇ−ＴＳで約１．５倍の
上昇が確認された。オゾンによる可溶化により嫌気性消
化効果が促進され、少なくとも２０〜４０ｍｇＯ3／ｇ
−ＴＳ程度のオゾン添加率で、汚泥の減容化および消化
ガス発生量増加の効果が得られる。From the following results, it was clarified that the effect of promoting anaerobic digestion was obtained by solubilizing the concentrated excess sludge with ozone. Comparing untreated concentrated excess sludge with ozone-treated concentrated excess sludge,
At an addition rate of 40 mg-O 3 / g-TS, TS was 24,
490 mg / l → 22,865 mg / l, and VTS decreased from 76.11% → 73.56%.
In addition rate of 40mg-O 3 / g-TS , digestibility increase of about 9 points, increase of about 7 points VTS decomposition rate was confirmed. Gas generation amount per charged VTS increases in proportion to the ozone addition rate, 20mg-O 3 / g- TS at about 1.3 times, 40mg-O 3 / g- TS about 1.5-fold increase Was confirmed. The anaerobic digestion effect is promoted by solubilization with ozone, at least 20 to 40 mg O 3 / g
The effect of reducing the volume of sludge and increasing the amount of digested gas generated can be obtained at an ozone addition rate of about -TS.
【００３５】以上より、濃縮余剰汚泥をオゾンによって
可溶化し、次いで嫌気性消化することによって、汚泥の
減容化効果が高められることが示された。表５に、結果
をまとめたので示す。From the above, it was shown that the effect of reducing the volume of sludge can be enhanced by solubilizing concentrated excess sludge with ozone and then performing anaerobic digestion. Table 5 summarizes the results.
【００３６】[0036]
【表５】 [Table 5]
【００３７】[0037]
【発明の効果】以上のとおり、本発明によれば、余剰汚
泥を濃縮し、この濃縮汚泥に対してオゾン処理すること
によって、汚泥を可溶化させ、嫌気性消化の分解率を高
め、消化ガスの発生量の増加を図り、もって汚泥の減容
化率を高めることにより、後段の脱水負荷を低減させ
る。また、可溶化処理を施した汚泥を好気性生物処理へ
返送させないことによりリンや窒素などの返送・循環系
内への蓄積を回避することができる。As described above, according to the present invention, excess sludge is concentrated, and the concentrated sludge is subjected to ozone treatment to solubilize the sludge, increase the decomposition rate of anaerobic digestion, and improve digestion gas. The dewatering load at the subsequent stage is reduced by increasing the amount of wastewater generated and thereby increasing the sludge volume reduction rate. Further, by not returning sludge that has been subjected to the solubilization treatment to the aerobic biological treatment, it is possible to avoid accumulation of phosphorus, nitrogen, and the like in the return / circulation system.
【図面の簡単な説明】[Brief description of the drawings]
【図１】第１の実施の形態を示すフローシートである。FIG. 1 is a flow sheet showing a first embodiment.
【図２】第２の実施の形態を示すフローシートである。FIG. 2 is a flow sheet showing a second embodiment.
【図３】実験に用いたオゾン処理装置の概要図である。FIG. 3 is a schematic diagram of an ozone treatment apparatus used in an experiment.
【図４】実験に用いた嫌気性消化処理装置の概要図であ
る。FIG. 4 is a schematic diagram of an anaerobic digestion apparatus used in an experiment.
【図５】従来例のフローシートである。FIG. 5 is a flow sheet of a conventional example.
１…貯留槽、２…曝気槽、３…沈澱槽、４…水質調整
槽、５…濃縮装置、６…加熱装置、７…オゾン処理装
置、８…嫌気性消化処理装置、９…脱水機。DESCRIPTION OF SYMBOLS 1 ... Storage tank, 2 ... Aeration tank, 3 ... Precipitation tank, 4 ... Water quality adjustment tank, 5 ... Concentrator, 6 ... Heating apparatus, 7 ... Ozone treatment apparatus, 8 ... Anaerobic digestion processing apparatus, 9 ... Dehydrator.
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 4D059 AA05 BA11 BA21 BA56 BB01 BC02 BE00 BE38 BF02 BF15 BJ01 BK12 CA14 CC01 CC04 DA43 EA04 EA06 EA09 EB06 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4D059 AA05 BA11 BA21 BA56 BB01 BC02 BE00 BE38 BF02 BF15 BJ01 BK12 CA14 CC01 CC04 DA43 EA04 EA06 EA09 EB06
Claims (5)
発生する余剰汚泥の処理方法であって、 余剰汚泥を濃縮処理した後に、濃縮した余剰汚泥をオゾ
ンによって可溶化処理し、その後この可溶化処理汚泥を
嫌気性消化処理することを特徴とする汚泥の処理方法。1. A method for treating excess sludge generated by aerobic biological treatment of an organic effluent, wherein the excess sludge is concentrated, and then the concentrated excess sludge is solubilized with ozone. A method for treating sludge, comprising subjecting solubilized sludge to anaerobic digestion.
を５０℃以上１００℃未満の温度に加熱処理を行う請求
項１記載の余剰汚泥の処理方法。2. The method for treating excess sludge according to claim 1, wherein the excess sludge is heated to a temperature of 50 ° C. or more and less than 100 ° C. before the solubilization treatment with ozone.
ない請求項１記載の余剰汚泥の処理方法。3. The method for treating excess sludge according to claim 1, wherein the solubilized sludge is not returned to the aerobic biological treatment.
する余剰汚泥を濃縮処理する手段と、濃縮した余剰汚泥
をオゾン処理によって可溶化する手段と、その可溶化処
理汚泥を嫌気性消化処理手段とを含むことを特徴とする
汚泥の処理装置。4. Means for concentrating excess sludge generated by aerobic biological treatment of an organic wastewater, means for solubilizing the concentrated excess sludge by ozone treatment, and anaerobic digestion treatment of the solubilized sludge. And a means for treating sludge.
する余剰汚泥を濃縮処理する手段と、濃縮した余剰汚泥
をオゾン処理および熱処理によって可溶化する手段と、
その可溶化処理汚泥を嫌気性消化処理手段とを含むこと
を特徴とする汚泥の処理装置。5. Means for concentrating excess sludge generated by aerobic biological treatment of organic wastewater, means for solubilizing the concentrated excess sludge by ozone treatment and heat treatment,
An apparatus for treating sludge, comprising: means for anaerobic digestion of the solubilized sludge.
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|---|---|---|---|
| JP2000193875A JP2002001398A (en) | 2000-06-28 | 2000-06-28 | Process and equipment for treating sludge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000193875A JP2002001398A (en) | 2000-06-28 | 2000-06-28 | Process and equipment for treating sludge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002001398A true JP2002001398A (en) | 2002-01-08 |
Family
ID=18692791
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000193875A Pending JP2002001398A (en) | 2000-06-28 | 2000-06-28 | Process and equipment for treating sludge |
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| Country | Link |
|---|---|
| JP (1) | JP2002001398A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013515600A (en) * | 2009-12-24 | 2013-05-09 | ビーシーアール・エンバイロンメンタル・コーポレーション | Improved digestion of biosolids in wastewater |
| JPWO2017213024A1 (en) * | 2016-06-08 | 2018-06-21 | 三菱電機株式会社 | Sludge treatment apparatus and sludge treatment method |
| CN112321113A (en) * | 2020-10-30 | 2021-02-05 | 上海市政工程设计研究总院（集团）有限公司 | Sludge treatment method and anaerobic digestion tank |
| CN112919751A (en) * | 2019-12-06 | 2021-06-08 | 三菱电机株式会社 | Sludge treatment system and sludge treatment method |
-
2000
- 2000-06-28 JP JP2000193875A patent/JP2002001398A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013515600A (en) * | 2009-12-24 | 2013-05-09 | ビーシーアール・エンバイロンメンタル・コーポレーション | Improved digestion of biosolids in wastewater |
| US9758401B2 (en) | 2009-12-24 | 2017-09-12 | Bcr Environmental Corporation | Digestion of biosolids in wastewater |
| JPWO2017213024A1 (en) * | 2016-06-08 | 2018-06-21 | 三菱電機株式会社 | Sludge treatment apparatus and sludge treatment method |
| CN112919751A (en) * | 2019-12-06 | 2021-06-08 | 三菱电机株式会社 | Sludge treatment system and sludge treatment method |
| CN112321113A (en) * | 2020-10-30 | 2021-02-05 | 上海市政工程设计研究总院（集团）有限公司 | Sludge treatment method and anaerobic digestion tank |
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